Does my Mavic have any internal memory. I I take my advice card out will it still have saved/ stored images on it?

The Mavic has an internal SD card for storage of flight data only, all photos/videos are stored on the external (removable) SD card and cached on the device you are using to fly. So yes images will still be on the SD Card until you either format the card or delete the files from it.

no - the mavic does not have internal storage - only sd card storage.

I would recommend you use the SD card to save the original videos and photos. Or you can only get cache files in your phones. Thanks for your support.

What file format should it have?
FAT32, nfts or exFAT?